Temperature and strain rate dependent behavior of polymer separator for Li-ion batteries
Abstract
Safe performance of advanced Li-ion batteries relies on integrity of the separator membrane which prevents contact between electrodes of opposite polarity. Current work provides detailed study of mechanical behavior of such membrane. Temperature and strain rate sensitivity of the triple-layer polypropylene (PP)/polyethylene (PE)/polypropylene (PP) porous separator for Li-ion batteries was studied experimentally under controlled temperatures of up to 120° (393 K), and strain rates (from 1∙10-4s-1 to 0.1s-1). Digital image correlation was used to study strain localization in separator under load. The results show significant dependence of mechanical properties on temperature, with the yield stress decreasing by 30% and elastic modulus decreasing by a factor of two when the temperature is increased from 20 °C to 50 °C. The strain rate strengthening also decreased with higher temperatures while the temperature softening remained independent of the applied strain rate. Application of temperature creates long lasting changes in mechanical behavior of separator as was revealed by performing experiments after the annealing. Such delayed effect of temperature application appears to have directional dependence. The results demonstrate complex behavior of polymer separator which needs to be considered in proper safety assessments of Li-ion batteries.
- Authors:
-
[1];
[2];
[3];
[1];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); National Highway Traffic Safety Administration; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
- OSTI Identifier:
- 1425339
- Alternate Identifier(s):
- OSTI ID: 1495508
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Extreme Mechanics Letters
- Additional Journal Information:
- Journal Volume: 20; Journal Issue: C; Journal ID: ISSN 2352-4316
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Li-ion; Separator; Mechanical; Safety; Energy storage
Citation Formats
Kalnaus, Sergiy, Wang, Yanli, Li, Jianlin, Kumar, Abhishek, and Turner, John A. Temperature and strain rate dependent behavior of polymer separator for Li-ion batteries. United States: N. p., 2018.
Web. doi:10.1016/j.eml.2018.01.006.
Kalnaus, Sergiy, Wang, Yanli, Li, Jianlin, Kumar, Abhishek, & Turner, John A. Temperature and strain rate dependent behavior of polymer separator for Li-ion batteries. United States. https://doi.org/10.1016/j.eml.2018.01.006
Kalnaus, Sergiy, Wang, Yanli, Li, Jianlin, Kumar, Abhishek, and Turner, John A. Wed .
"Temperature and strain rate dependent behavior of polymer separator for Li-ion batteries". United States. https://doi.org/10.1016/j.eml.2018.01.006. https://www.osti.gov/servlets/purl/1425339.
@article{osti_1425339,
title = {Temperature and strain rate dependent behavior of polymer separator for Li-ion batteries},
author = {Kalnaus, Sergiy and Wang, Yanli and Li, Jianlin and Kumar, Abhishek and Turner, John A.},
abstractNote = {Safe performance of advanced Li-ion batteries relies on integrity of the separator membrane which prevents contact between electrodes of opposite polarity. Current work provides detailed study of mechanical behavior of such membrane. Temperature and strain rate sensitivity of the triple-layer polypropylene (PP)/polyethylene (PE)/polypropylene (PP) porous separator for Li-ion batteries was studied experimentally under controlled temperatures of up to 120° (393 K), and strain rates (from 1∙10-4s-1 to 0.1s-1). Digital image correlation was used to study strain localization in separator under load. The results show significant dependence of mechanical properties on temperature, with the yield stress decreasing by 30% and elastic modulus decreasing by a factor of two when the temperature is increased from 20 °C to 50 °C. The strain rate strengthening also decreased with higher temperatures while the temperature softening remained independent of the applied strain rate. Application of temperature creates long lasting changes in mechanical behavior of separator as was revealed by performing experiments after the annealing. Such delayed effect of temperature application appears to have directional dependence. The results demonstrate complex behavior of polymer separator which needs to be considered in proper safety assessments of Li-ion batteries.},
doi = {10.1016/j.eml.2018.01.006},
journal = {Extreme Mechanics Letters},
number = C,
volume = 20,
place = {United States},
year = {2018},
month = {3}
}
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Figures / Tables:
Table 1: Properties of Celgrad 2325 Separator